Hollow blast grate-bar.



PA'TENTED JULY 5; 190- A. WILLARD. I HOLLOW BLAST GRATE BAR.

APPLICATION FILED OUT 6. 1903.

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1]]11Jld1] PATENTED JULY '5, 1904.

J. A. WILLARD. HOLLOW BLAST GRATE BARN APlLIUATION FILED OUT. 6, 1903.

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UNTTEn STATES Patented July 5, 1904.

PATENT OEEIcE.

THREE-FOURTHS TO YVILLIAM M. LASLEY, THE

ODORE LASLEY,

AND CHARLES L. HALL, OF CHATTANOOGA, TENNESSEE.

HOLLOW BLAST GRATE-QBAR.

SPECIFICATION forming part of Letters Patent No. 764,511, dated July 5, 1904.

Application filed October 6, 1903.

To all whom it may concern:

Be it known that I, JAMns A. VVILLAED, a citizen of the United States, residing at Chattanooga, in the county of Hamilton and State of Tennessee, have invented new and useful Improvements in Hollow Blast Grate-Bars, of which the following is a specification.

This invention relates to certain new and useful improvements in hollow blast gratebars, and is particularly adapted for use in increasing combustion.

The invention aims to construct a hollow blast grate-bar which is provided with one or more blowers for steam, causing thereby an automatic suction of air, thus obtaining the necessary amount of air for the blast which is supplied to the grate-bar and then exhausted therefrom to increase combustion.

The invention further aims to construct a hollow blast grate bar which shall be extremely simple in its construction, strong, durable, eflicient in its use, and comparatively inexpensive to manufacture.

With the foregoing and other objects in view the invention consists of the novel combination and arrangement of parts hereinafter more specifically described, illustrated in the accompanying drawings, and particularly pointed out in the claims hereunto appended.

In describing the invention in detail reference is had to the accompanying drawings, forming a part of this specification, wherein like reference characters indicate corresponding parts throughout the several views, and in which Figure 1 is a longitudinal sectional view of the grate-bar provided with a single blower device. Fig. 2 is a cross-sectional View of the hollow grate-bar. Fig. 3 is a longitudinal sectional View of the grate-bar with a pair of blowers, and Fig. 4 is a section on line 4 4 of Figs. 1 and 3.

Any construction of hollow grate-bar may be employed and as many blowers as desired, the blowers communicating with the bottom of the grate-bar and suitably disposed throughout the bottom.

As shown, the hollow grate-bar is indicated Serial No. 176,000. (No modeL) by the reference character 1 and is provided throughout the upper portion thereof with the inclined outlet-openings 2 for the blast. In Fig. 1 the bottom of the grate-bar is provided with an inlet-opening 3, and depending from the bottom of the grate-bar 1, with the inner face thereof in alinement with. the wall of the inlet-opening 3, is an outer conicalshaped sleeve 4, provided with the openings 5. Arranged within the sleeve 4 is an up wardly-extending conical-shaped sleeve 6, having its bottom provided with an outwardly-extending flange or ridge 7, upon flange or ridge 7 and spider 8. The clampingrods on their lower ends are provided with heads 12 and their upper ends with screwthreads engaging the female screws in the bottom of the grate-bar 1. It will be evident that when the clamping-rods are screwed home the sleeves, spider, and nozzle will be securely connected together as well as supported.

In Fig. 3 of the drawings the grate-bar is shown as provided with a pair of blowers, and as the construction of each blower shown in Fig. 3 is the same as that shown in Fig. 1, it is thought unnecessary to describe the blowers shown in Fig. 3, so the same reference characters will apply thereto. The only difference is that the nozzles are connected together by a steam-supply pipe 13, which in turn is connected to a single steam-feed pipe 14.

' The operation is as follows: Steam is allowed to escape through the nozzle 9 into the air-space 15 formed between the sleeve 6 and nozzle 9, and as the steam leaves the mouth of thenozzle 9 under pressure it drives tlie air out of the air-space 15, and when this takes place a vacuum is formed in the lower part of the air-space 15. As the air rushes in to take the place of the vacuum formed it passes in front of the nozzle 9, where the steam escaping drives it forward until it passes the mouth of the sleeve 6. Here the same action takes place that is to say, a vacuum is created in the air-space 16 formed between the sleeves 4 and 6, and as the air rushes in through the openings 5 until it passes the top of the sleeve 6 it is then caught by the pressure of the steam and driven forward into the hollow part of the grate-bar 1, where it is then driven out through the openings 2 in the cover of the grate-bar.

In large bars it will probably be necessary to have two or more blowers. It will be evident that in a small bar but one blower will be suificient.

It is thought the many advantages of my new and improved hollow blast grate-bar can be readily understood from the foregoing description, taken in connection with the accompanying drawings, and it will also be evident that I have devised a simple, inexpensive, and

novel form of hollow blast grate-bar for increasing combustion and which is applicable for furnaces of every description where a blast is desired, and it will furthermore be evident that changes,variations, and modifications may be resorted to without departing from the spirit of the invention or sacrificing any of its advantages, and I therefore do not wish to restrict myself to the details of construction hereinbefore described and as shown in the accompanyingdrawings, but reserve the right to make such changes, variations, and modifications as come properly within the scope of the protection prayed.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A hollow grate-bar provided with an inlet in its bottom wall and further provided with suitable outlets, a sleeve depending from the bottom of the grate-bar and communicating with said inlet, said sleeve provided with openings, a sleeve extending in the said sleeve, a nozzle extending in said inner sleeve and communicating with a steam-supply, said inner and outer sleeves forming an air-space between them and said inner sleeve and nozzle forming an air-space betweenthem, said airspaces communicating with the atmosphere, and means connected with the said sleeves and nozzle and with the bottom of the grate-bar for connecting the sleeves and nozzle together and for suspending said sleeves and nozzle from the bottom of the grate-bar.

2. A hollow grate-bar provided with an inlet in its bottom wall and outlets, a sleeve communicating with said inlet, a sleeve extending in said sleeve and provided with a flange upon which rests the lower end of the outer sleeve, a nozzle extending in the inner sleeve, said inlet and sleeves forming air-spaces communieating with the atmosphere, and means connected with the sleeves and nozzle and with the grate-bar for suspending the said sleeves and nozzles from the bottom of the grate-bar.

3. A hollow grate-bar provided with a plurality of inlets in its bottom wall and further provided with a plurality of outlets, a sleeve communicating with each of said inlets, a sleeve extending into each of said outer sleeves, a nozzle extending in each of said inner sleeves, said sleeves and nozzles forming air-spaces communicating with the atmosphere, and means for connecting said sleeves and nozzles together and for suspending said sleeves and nozzles from the, bottom of the grate-bar.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

JAMES A. WILLARD.

Witnesses:

FRANK CALDWELL, M. FLEM. RING. 

